N. N. Semenchenko

  • Citations Per Year
Learn More
We present the results of analysis of the group growth of the Low Amur grayling Thymallus tugarinae from 18 rivers of the Low Amur basin, tributaries of the Bureya and Ussuri rivers. We made use of the published data on the fishes of Sakhalin Island. The dwarf and fast-growing forms are not revealed among the investigated groups of this species. The(More)
We discuss peculiarities of the reproductive biology of lower Amur grayling Thymallus tugarinae. The sex ratio in most of the studied samples was close to 1 : 1, but sometimes it might differ due to various reasons. Females dominated among the specimens entering the first reproduction period; the rate of females decreased in the fish older than 5 years.(More)
We consider age composition of samples of the Lower Amur grayling Thymallus tugarinae inhabiting water bodies of the lower and middle course of the Amur and several rivers of the northwestern part of Sakhalin Island and the southern coast of the Sea of Okhotsk. Age composition of the Lower Amur grayling from the studied samples is not similar because of(More)
A nonlinear regression model of body length dynamics was constructed for age smolts greater than two years old of the sockeye salmon Oncorhynchus nerka of Lake Kuril'skoe (Kamchatka). The analysis of variance showed that about 93% of the variation of body length is accounted for by the fish population density and water temperature. The reasons for the(More)
A mathematical model explaining mechanisms of formation of multitmodal recruitment curves without participation of depensatory mortality was constructed. It was shown that the number of generations of red salmon from Dal'nee Lake at the sea migration stage was satisfactorily explained by the influence of the number of parents and the duration of habitation(More)
  • 1